optimg

A tiny Python CLI/library wrapping the JPEG and PNG optimization file size. It uses jpegoptim and optipng as optimization programs.

Note

For now only JPEG optimization is available and it's not loseless ! It will set the JPEG size to a maximum of 1 Mb. Thus, may reduce drastically the quality... Should be fixed in future release.

Install

Make sure jpegoptim and optipng are installed on your system and are available in your PATH.

On Ubuntu:

sudo apt install jpegoptim optipng

Other system:

sudo consider-using-linux-quickly-or-die

Install the CLI in a dedicated environment:

make install

It will install the CLI in a Python virtual env: venv.dist.

Under your virtual environment:

optimg --help

usage: optimg [-h] [--mimetype {JPEG,PNG}] [--size {TINY,MEDIUM,LARGE,FAT}] [--dest DEST] [--workers WORKERS] [--show] [--debug] src

Optimize JPEG and PNG files from a directory.

positional arguments:
  src                   Directory path to scan.

options:
  -h, --help            show this help message and exit
  --mimetype {JPEG,PNG}
                        Filter by mimetype. Default is all.
  --size {TINY,MEDIUM,LARGE,FAT}
                        Filter by file size. Default is all.
  --dest DEST           Base destination directory of optimized files.
  --workers WORKERS     Number of workers used to optimize files.
  --show                Details the directory by mimetypes and quit.
  --debug               Set log level to debug. Default is info.

You're good ! Enjoy !

Examples

• Optimize JPEG files of MEDIUM size:

optimg /my/path --size MEDIUM --mimetype JPEG

[INFO] - 2025-10-22 12:30:30,209 - launching optimization (6145) for type: image/jpeg and size range: MEDIUM on 4 workers...
Optimizing...:   6%|██████▎                                                                                                         | 344/6145 [00:01<00:30, 193.12it/s

Note

The default base destination directory is the data folder if you don't provide --dest optional argument. It will be automatically created in the current path where the CLI is launched.

ALL the files path are preserved (sub-directory creation etc...). The base destination directory is here to put the files optimized elsewhere and not overwrite the originals.